From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Results of further tests carried out on the .940 lead steering nut F.73600 and worm F.73600-1.
| Identifier | ExFiles\Box 17\4\ Scan064 | |
| Date | 6th December 1933 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from RHC.{R. H. Coverley - Production Engineer} X7J30 RHC.{R. H. Coverley - Production Engineer}1/AP.6.12.33. Steering Nut F.73600 (.940 Lead) The following are the results of further tests carried out on the .940 lead nut & worm F.73600-1 in confirmation of the figures given in our previous report RHC.{R. H. Coverley - Production Engineer}8/BE.24.11.33.:- | Axial Load on Nut. (Lbs.) | Effort in lbs. at 20" Rad. | Efficiency. | |---------------------------|-----------------------------|-------------| | 300. | 3.5 | 64.00% | | 600 | 6.5 | 69.00% | | 900 | 10.0 | 67.25% | | 1200 | 13.0 | 69.00% | The Works were also asked to make an independent check and have given us the following information: | Axial Load on Nut. (Lbs.) | Effort in lbs. at 20" Rad. | | | Mean Efficiency. | |---------------------------|----------------------------|---------------|---------------|------------------| | | Top of worm. | Middle of worm. | bottom of worm. | | | 300 | 3.5 | 3.5 | 3.5 | 64.00% | | 600 | 7.5 | 7.5 | 7.5 | 60.00% | | 900 | 11.0 | 10.5 | 11.0 | 62.50% | | 1200 | 13.0 | 12.75 | 13.0 | 69.50% | It will be observed that the results differ slightly from the previous figures, but the method of checking the readings being somewhat crude, allows for certain inaccuracies to creep in. continued. | ||